Hello Ross,
Are these just IMDb pop-up ads on the web pages or are they separate emails?

If they are pop-up or online ads then there’s not a lot you can do about those apart from maybe play around with your preferences a bit. Apart from that, like most pop-up & in-line ads, they can be ignored.

If they’re separate emails, are there any links in them where you can say “No more of those thanks.”